Voltage-regulator.



A. A. TlRRlLLx VOLTAGE REGULATOR. 'APPLlCATlON mu) OCT. 4. 1911. RENEWED APR. 14.1915.

1 ,1417 5569, Patented July 20, 1915.

UNITED STATES T QFFICE,

ALLEN A. TIRRILL,

OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

VOLTAGE-REGULATOR.

Specification of Letters Patent.

Patented July 20, 1915.

Application filed October 4, 1811. Serial No. 652,842. Renewed April 1%, 1915. Scrial No. 21,447.

To all 20750772, it may concern:

Be it known that l, ALLEN A. TIRRILL, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Voltage Regulators, of which the following is a specification.

My inventon relates to voltage and current regulators, and it has for its object to provide'a simple and effective regulator for the field excitaton of a dynamo-electric machine.

My. invention is illustrated in the accompanying drawing, Figure 1 of which is a iagrammatic view of a system embodying the same, and Fig. 2 is a similar view of a modification of the system of Fig. 1.

As illustrated, the system in connection with which the present invention is employed comprises a generator 1, that is con nected to a distributing circuit 23l, and the field magnet 5 of which is supplied from the armature 6 of an exciter having a field magnet winding 7 that is shunt-excited, or that may be excited from any other suitable source.

The regulator comprises two cooperating movable contact members 8 and 8 that are respectively carried by levers 9 and 10, the

lever 9 being actuated by an electromagnet winding 11 that receives energizing current from the distributing circuit 234.. The core-12 of the winding 11 is partially counterbalanced by an adjustable counterweight 13, and the movements of the lever 9 and contact member 8 are retarded by means of a dash pot 14. The winding 11 is energized to varying degrees by variations of the voltage of the circuit 2-34, and accordlngly raises and lowers the core 12, thereby varying the distance of the contact member from the member 8 If desired, instead of supplying the winding 11 with current prdportional to the voltage of the circuit 23-4. it may be connected in series with one of the conductors of the said circuit, or otherwise suitably supplied with current proportional to that traversing the said Cir-- cuit. The contact member 8 may also be actuated in" response to variations of any other desired electrical condition of the circuit 2-3-or of the generator 1.

The contact member 8 and the lever 10 are actuated by an electromagnet winding 6 having a core 17 that is carried by the lever 10 and is somewhat more than counterbalanced by a spring 18. The winding 16 is supplied from the armature 19 of a small auxiliary generator that may be, as illustrated in F ig. 1, directly connected to the exciter, or otherwise arranged to be driven by the same or any other source of power, or, as illustrated in Fig. 2, it may be driven by separate small motor 21 that is supplied with current from the distributing circuit 2-3-t The auxiliary generator is provided, with a field magnet winding 22 that is preferably shunt-excited from the armature 19, though it ma Y be sup-plied with current from any other suitable source. In series with the field magnet windings 7 and 22, are resistors 23 and 24, respectively, that are adapted to be periodically'shunted by a relay having two pairs of coiipera-ting staa le contact members 26 and 28 are actuated by an electromagnet winding 29, the circuit of which is controlled by the contact terminals 8 anid fi and is supplied with current from the armature 19 of the auxiliary generator. If desired, a may be employed instead of the single relay shown, their actuating windings being connected in parallel.

i In the operation of the regulator, the position of the contact terminal 8 is caused tovary, by the winding 11, in accordance with variations of the voltage or other desired electrical condition'of the circuit 23-'l, and the contact terminal 8 is moved into and out of engagement with the terminal 8 by reason of the fluctuations of the voltage of the auxiliary generator caused by the alternate opening and closing ofcthe shunt circuit to the resistor 24. Thus, if the voltage of the circuit 2- 3-i diminishes, the contact terminal 8 will. be raised and, by reason of the engagement of the contact terminal 8 therewith, the circuit of the relay magnet wind- 1 ing 29 will be established, with the result that the'resistors 23 and 24 will be shunted. Upon shunting of the resistor 23, the field excitation and voltage of the exciter increase, followed by a corresponding increase of the excitation of the field of the main generator. This, in turn, raises the voltage of the circuit 2-8t, accompanied by a lowering of the contact terminal 8 by reason of the greater energization of the wind ng plurality of ielays menses 11. hen the resistor 24: is shunted, the for regulating in accordance with variations field excitation and voltage 01 the auxiliar of any other electrioal'condition than voltgenerator also increase, accompanied. by an age, andicr many other conditions than that increase of the energization of: t. e Winding specifically shown, and it may be employed 5 16, which thereupon rnoves the contact terin connection with direct cu rent machines,

rninal 8 out of w h the contact as Well as with alternators. terminal 8. Upon separation I the contact I claim as my invention:

terminals 8 and 8 the relay magnetwind- 1. The combination with a dynamo-elecing 29 is deeiiergised and shuns; circs trio machine, an eXciter therefor, and an 10 to the resistors 23 and EA are interrupted, ry generator, of resistors in the re causing: thevoltag'es o the exciter and auxilspectiye circuits of the field magnet Windiary generator to be diminished. This ings'or the exciter and auxiliary. generator,

. is followed by ell sent the contact and'rneans, independent of variations of the terminals 8 and 8 and the contact terminals exciter voltage but responsive to variations 15 8 and 8 are thus H'lOVQCl into and out of of the respective voltages of the dynamogageinent during the contoured operation of electric machine and the auxiliary generator the regulator. for short-circuiting the said resistors. 8 As the position oi the contact member 8 2. The combination with a dy varies w ch the electrical c :1 or achme, an exciter therefor, and an 29 distributing; circuit, the

ment and disengagement of she sai 'inber spective circuits of the field magnet Windwith the member 8 "will correspondingly of the excite and auxiliary generator, vary, with the result the excitation of and means, independent of ariations of the the main generator l, by proper conexcitcr voltage but responsive to Variations 25 struction and ad os n 'ageaux' ry generator, of resistors in the rer ent oi the apparatus, of the GlQClillC..i conditions of the dynamobe caused to vary in such a manner as to else 310 machine and the auxiliary generator maintain the voltage or other desired elecfor short-circuiting the said reslstors. trical condition at substantially the required The combination with a dynamo-elecvalue. tric machine, an eXciter therefor, and an 0 Since the resistors 23 anl are shunted auxiliary generator, the said exciter and substantially simultaneously, it is obvious auriiliary generator having independent field that the fluctuations of the voltage of the and armature circuits, of a regulator for the auxiliary generator Will be similar and cordynamo-electric machine comprising means respond to the iiuct ations of the exciter for correspondingly adjusting; the resistances voltage. in order to secure proinptness, and of the respective field circuits of the exciter the proper degree, of regulation of the er;- and the auxiliary generator.

citation of the main it is usually 4. The combination with a dynamo-elecnecessary that the excite; voltap'e b trio machine, on exciter therefor, and an or fluctuation between Wide 1'. auxiliary generator, the said eXciter and otherv hand, it is d sirable tha he voltage axiliary generatorhaving independent field applied to the windings l6 and 29 should and armature circuits, of a regulator for the 'iuctuate so greatly, ant .iis condition is dynamo electric machine comprising means ole the present instance confor correspondingly adjusting the respective 1. ie exciter and the i y g'enfield strengths of the exciter and the auxilerator, d by the resistances of iary generator.

the r field circuits, so the es The combination with an electrical cirtheir generated voltages ZQQEYWEJ- emit, a dynamo-electric machine associated" each other. vi :1 n a therewith, an excite: for'the dynamo-electric machine, and an auxiliary generator having an armature circuit independent of that of nc s for correspondingly otive field 5 ons liO'HS of the said ciritor.

have hereunto o day of October,

1 ll 1%.. Till-R1111.

"time GSSGS Z t Eat-anti, 

